Hydrogen is one of the Resources in the game Oxygen Not Included. It is an unbreathable Gas that is extremely light and will rise above all other gases. This means that it will settle at the top of rooms and other open areas.

Hydrogen can easily be density-separated with a reverse funnel at the top of your base, and collected with a pump when levels get too high.

It can be condensed into Liquid Hydrogen to serve as a rocket fuel for Hydrogen Engine, the most powerful type of rocket-engine. Condensation of Hydrogen requires a dedicated cooling setup using the most advanced materials.

It can be stockpiled and utilized as heat transfer agent due to its high thermal parameters.

Hydrogen can be used to power the Anti Entropy Thermo-Nullifier, which produces -80 kDTU/s at the cost of only 10 g/s of Hydrogen. Venting extra hydrogen into the cold biome and then back, or using natural convection, will quickly cool your base.

Locking Wheezeworts in a room with a Hydrogen atmosphere, increases their cooling efficiency.

Thermo Regulators can be put in the same room, it will prevent them from overheating, while they are used to cool other gases in your base (like your oxygen).

More power-efficient setup, that generates consistent, controlled temperature, will include Mechanized Airlock paired with Thermo Sensor and oil/metal buffer.

An example oxygen production system using a Hydrogen Generator that runs off of the Hydrogen made in an Electrolyzer - in this setup the Duplicants will rarely have to run on the wheel to provide additional power

The pipe layout for the previous example - the gas filter is set to filter out Hydrogen and the top room's atmosphere is closed off from the rest of the base

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